Black Pill
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The Black Pill development board is a good choice. As for the Blue Pill many different versions exist, but unlike the Blue Pill, at least at the time of writing this, they all appear to be using genuine STM32 processors (read: no cheaper clones exist).
The Black Pills are typically based on a STM32F401 or STM32F411 (both of the above are the F411 version) and offers the following specs:
- STM32F4 (STM32F401 or STM32F411) processor
- Same footprint (I/O pins)
- 25 MHz main crystal
- 32.768 kHz RTC crystal
- USB-C connector
- Programming header
